UPD78F0138 NEC, UPD78F0138 Datasheet - Page 420

• Manufacturer Part Number: UPD78F0138
• Description: (UPD78xxxx) 8-Bit Single-Chip Microcontrollers
• Manufacturer: NEC

23.5 Cautions for Low-Voltage Detector
(V
(1) When used as reset
(2) When used as interrupt
<Action>
(1) When used as reset
420
LVI
In a system where the supply voltage (V
In this system, take the following actions.
), the operation is as follows depending on how the low-voltage detector is used.
The system may be repeatedly reset and released from the reset status.
In this case, the time from release of reset to the start of the operation of the microcontroller can be arbitrarily set
by taking action (1) below.
Interrupt requests may be frequently generated. Take action (2) below.
After releasing the reset signal, wait for the supply voltage fluctuation period of each system by means of a
software counter that uses a timer, and then initialize the ports.
CHAPTER 23 LOW-VOLTAGE DETECTOR
DD
) fluctuates for a certain period in the vicinity of the LVI detection voltage
User’s Manual U16228EJ2V0UD